Donation is a technique where you temporarily cover your open columns underneath, which will subsequently be uncovered by using a method that preserves Back-to-Back (e.g., a TSD) to clear the lines. With the recent emphasis on maintaining high efficiency in stacking, donations have become an essential technique to incorporate while managing one's stack.
Main benefits of using donations include:
- Gives you an alternative way to arrange your minos.
- Preserves the lines underneath. An example would be preserveing clean garbage lines with parapet.
- Appropriate uses of donations can lead to cleaner stacks. A good example of this is using Kaidan to fix the parity of your stack. However the opposite can also happen when used inappropriately.
- Each mino fills 4 blocks of your board. Because you're leaving unfilled blocks underneath with donations, this also means pieces a less number of required minos when you're trying to build the the T-spin shape. See below for an example.
This page is an overview of donation techniques. Refer to these below pages if you are looking for specific examples:
Step 1. Picture how you would make the base and overhang for the T-Spin.
When doing this, it's important to think about which lines will be cleared. In this case, it means that you shouldn't fill more than 2 blocks on the column marked red (shown on the second picture below). Otherwise the hole will remain covered after doing the T-Spin.
Step 2. Look at the queue and see if a donation is possible. If not, see if there's an alternate way to make a donation by repeating Step 1.
Example queue 1: SIZTO
Example queue 2: ZJLT
Example queue 3: SJITT. We will have to rethink our donation for this sequence.
Below are common donation techniques that have their own name.
The knowledge about different characteristics of each minos can be useful.
Occupies 2 lines in all orientations. TSD-friendly.
TSD-friendly. Works very well for TSS donations too.
TSS-friendly. In order to use L or J in a TSD donation, you will often need to combine it with another piece.
This distinction is a technicality, but they actually refer to different things. The second image below is a donation. The floating lines are separate from the T slot. The third image below is an air T-Spin. The T slot itself is floating.
A shape can be both an air T-Spin and a donation:
Refer to this tweet for more examples:
Here's a visual explanation on how to differentiate between a floating T spin and a donation: pic.twitter.com/xKvS4ycLKb— Yakine (@yakine_tetris) August 5, 2018